Work holding and feeding means for sewing-machines.



I C. A. DEARBORN. WORK HOLDING AND FEEDING MEANS FOR SEWING MACHINES.

APPLICATION FILED FEB. 26, I913.

Patented Feb. 1, 1916.

2 SHEETS-SHEET I.

5 w uentoz C. A. DEARBORN.

WORK HOLDING AND FEEDING MEANS FOR SEWING MACHINES. 4

APPLICATION FILED FEB. 26. 1913.

Patented Feb. 1, 1916.

2 SHEETS-SHEET 2.

E] vwe VLtO? UNITED. STA ES CHARLES A. DEARBORN, OF NEW YORK, N. Y.

WORK HOLDING AND FEEDING MEANS FOR SEWING-MACHINES.

7 Specification of Letters Patent.

Patented Feb. 1,1916.

Application filed February 26; 1913. Serial No. 750,786.

'county, and State of New York, have invented certain new and useful Improvements in Work Holding and Feeding Means for Sewing-Machines, of which the following is a full and clear specification. r

The present invention relates particularly to improvements in work holding and feeding means for overseaming blind stitch work of the power driven type,.such as illustrated in Patent No. 1,025,082, granted to me on April 30th, 1912 L The machine of my above-named patent included among other improvements, an OS- cillatory toothed ridge-forming rib or disk mounted between the yielding cloth supporting plates in position to engage the work beneath the usual s'lot formed in the presser foot. The toothed ridge-forming disk of said patent is of articular importance in fulllng in or working in ,the under' layer of the work. In the patented structure the feeding mechanism included a feed arm which engaged the work above said toothed ridge-forming disk.

The present invention consists in providing upon the presser foot of this type of machine a yieldingly mounted cloth engaging plate which engages the work in the slot of the presser foot above the ridge-forming rib, the feeding mechanism being modified so as to engage the work only in front-0f the path of the needle and above the yielding cloth supporting members which are arranged upon opposite sides of the ridgeforming disk.

The purpose of the improved spring pressed cloth engaging plate is to closely confine the ridge of cloth upon the ridgeforming disk adjacent'to the path of the needle, so as to produce a more uniform and accurate blind stitch upon thin materials. This plate prevents the bulging of the cloth adjacentto the pathof the needle. I prefer to form the cloth engaging plate with forwardly presented teeth to efi'ectively coun teract any rearward mpvement of the cloth ilnder the action of the return movement of the toothed ridge-forming disk. The 010th engaging plate is also important in its action of holding the work against the toothed ridge forming disk in its fulling in operation.

As above stated the ridge-forming disk is mounted between two yielding cloth supporting plates which engage the under surface of the work. The feed finger which I now prefer to form with a single toothed feed foot, engages the work above these plates in' front of the path of the needle only.

To further improve the operation of the machine I have cut away the ridge-forming disk in front of its tooth or teeth so as to afford additional room in front of the path of the needle beneath the feed foot and between the yielding cloth supporting plates.

In order that my invention may be fully understood I will first describe the same with reference to the accompanying drawings and afterward point out the novelty more particularly in the annexed claims. I

In said drawings Figure 1 is a side eleva tion of the Dearborn type of blind stitch sewing machine, having the improvements iii the work holding and feeding means applied thereto. Fig'. 2 is a sectional plan view showing the machine presser foot and the parts cooperating therewith, for holding and feeding the work. Fig. 3 is a vertical sectional view of the same. Figs. 4 and 5 are detail views of the spring pressed work engaging plate. Fig. 6 is a perspective view ofthe improved ridge-forming disk.

The type of machine to which my present improvements are applied is well known in the art, so that I will only refer to such parts of the general construction of the machine as appear to be desirable to enable others to completely understand theinvention presented in this case, it being understood that a fuller explanation of the general construction of the machine can be had by referring to my above named Patent 1,025,082.

1 is the main frame of the machine, 2 is the main shaft, 3 is the looper shaft, and 4' is the needle shaft, the looper shaft and needle shaft being suitably operated from the main shaft 2..

5 is the usual needle carried by the needle rock arm which is mounted upon'the shaft 4.-

10 is the work supporting frame pivotally mounted at 11 and having a suitable spring device (not shown) for maintaining it in operative position. The work supporting frame carries an oscillating shaft 15 driven by any suitable means such as fully set forth in my above named patent and 16 is the improved form of ridge-forming disk mounted upon the shaft 15 and constructed as hereinafter explained.

20 are the yieldingly mounted work supporting plates arranged upon opposite sides of the ridge-forming disk 16 constructed and mounted preferably as set forth in my above named patent.

is a presser foot which ispreferably constructed and mounted as set forth in my above named patent. The presser foot 25 is presented. above the work supporting frame 10 in position to engage the work above the yieldingly mounted work supporting plates 20. The presser foot 25 is formed with the usual longitudinal slot 26 into which the ridge of material is pressed by the rib or disk 16.

30 is the feed foot mounted upon the usual arm or lever 31, and arranged to engage the upper surface of the work above the heels of the work supporting plates 20, in front of the transverse path of the needle;

The ridge-forming disk 16' is cut away as shown at 16 to provide increased space for the material in front of the path of the needle between the heels of the work supporting plates 20. This added space assists in preventing the objectionable crowding of the work, particularly in crossing seams. One or more cloth engaging teeth such as indicated at 16 may be provided upon the disk 16 to effect the fulling in operation of the disk. I

is the improved top cloth engaging plate formed with the forwardly and downwardly presented teeth 41 upon its inner Cal end. This plate 40 is soldered or otherwise rigidly secured to a U-shaped arm 42 which has hearings in the lugs 43 mounted upon the upper face of the presser foot 25. A tension spring 44 iscoiled around one leg of the rocking arm 42 with one end engaging the arm 42 and the other end engaging the upper face of the presser foot 25. This spring pressed cloth engaging plate 40 0perates in the slot 26 of the presser foot 25 and engages the ridge of work above the disk 16 just in rear of the path of the needle, with the result that the ridge of work is firmly pressed down upon the rib of disk 16, adjacent to the path of the needle, so that greater accuracy in making a blind stitch results. I have found from practice that the use of this spring pressed plate 40 enables me to produce satisfactory blind stitching upon much thinner material than can be satisfactorily stitched upon my machine without said plate. A further important result of the improved construction, is that the forwardly and downwardly presented teeth overcome the slight tendency of the cloth'to move rearwardly when the toothed ridge-forming disk is moved back for a new stroke and the plate also 5 of the presser foot and in rear of thepath of the needle.

2. In a sewing machine, the combination of stitch forming mechanism, with a work support, an oscillating ridge-forming rib carried by said work support, a slotted presser foot presented above said ridgeforming rib, and a work engaging member yieldingly mounted upon said presser foot in position to engage 'the ridge of work upon said rib in the slot of the presser foot and in rear of the path of the needle, said work engaging member having forwardly presented cloth engaging teeth.

3. In a sewing machine, the combination of stitch forming mechanism, with a work' support, a ridge-forming rib carried by said work support, a slotted presser foot presented above said ridge-forming rib, and a work engaging plate presented in the slot of said presser foot in position'to engage the ridge of work upon said rib, a supporting arm connected with said work engaging 'plate and pivotally mounted upon said presser foot. and a spring arranged between said supporting arm and the presser foot to yieldingly hold said plate to its work.

4. In a sewing machine, the combination of stitch forming mechanism, with-a work support, an oscillating toothed ridge-forming rib carried by said work support, a

presser foot arranged to engage work upon said work support. and a yieldingly mount ed member carried by said presser foot in position to engage the ridge of work upon said rib. said yieldingly mounted member having forwardly presented cloth engaging teet 1.

5. In a sewing machine, the combination of stitch forming mechanism, a work support, and a cooperating presser foot, with. a ridge-forming disk mounted upon said work support and having a portion of its peri hery entirely cut away in front of and elow the path of the needle to afford space for the work.

-6. In a sewing machine, the combination of stitch forming mechanism, with a work support, a cooperating presser foot, yielding cloth supporting plates upon said work support and a toothed ridge-forming disk mounted upon said work support between said plates and having a portion of its periphery entirely cut away in front of the S path of' the needle to afiord room for the work between said plates. 7 7. In a sewing machine, the combination of stitch forming mechanism, a work support, yielding cloth supporting plates a. mounted upon said work support, an oscillating ridge-forming disk mounted upon said work support between said plates and 1 having a portion of its periphery entirely cut away in front of the path of the needle, 

